Improvement in tellurians



2 Sheets-SheetZ.

G. MCBRIDE.

Tellurlan No. 221,838. Patented Nov. 18,1879.

INVENTOR %?7z WITNESSES TORN-EYS.

GIDEON MCBRIDE, OF DOVER HILL, INDIANA, ASSIGNOR TO HIMSELF AND WILLIAM F. FAAS, OF MINERVA, OHIO.

IMPROVEMENT Specification forming part of Letters Patent No. 221,838, dated November 18, 1879; application filed April 2, 1879.

, lowing is a specification.

The object of this invention is to furnish for the use of schools, 850., an improved tellurian of simple construction, by which the elliptical orbit of the earth around the sun and the or bit of the moon around the earth, together with all. the phenomena resultingi'rom the relation of sun, earth, and moon together, may be fully and lucidly illustrated, embracing among others the succession of day an d night, the changes of the seasons, the changes of the moon, solar and lunar eclipses, the entrance and progress of the sun into and through each of the twelve signs of the zodiac, the entrance and progress of the earth into and through each of the twelve months of the year, 850.

My present invention is an improvement upon the apparatus for which Letters Patent were granted to me December 25, 1877 5 and it consists in certain details of construction and arrangement, whereby the mechanism is simplified.

I will describe the whole apparatus in connection with the accompanying drawings, and then point out the invention in the claims.

In the drawings, Figure 1 is a sectional elevation of my improved tellurian. Fig. 2 is a plan View. Fig. 3 is a partial sectional plan. Fig. 4. is a section, showing the mechanism for revolving the earth and regulating the orbit of the moon. Fig. 5'isa cross-section of the post that sustains the earth.

Similar letters of reference indicate corresponding parts.

A represents the supporting-stand; B, a crank-shaft, which imparts, by bevel-gears a a,revolving motion tothe vertical arbor b, that is fitted at the center of stand A, andimparts revolving motion to the center-post E, that supports sun S. The sun S is held by friction on the top of post E, so that "it may be turned independently when required.

An elliptic recess, 0, is formed upon the stand by a hoop or flange, D, and a central collar, (7, around arbor b. A circular disk, 6,

post E loosely. The arbor 12 passes through the slot f of disk 0, and arbor b is fitted with an arm, 9, that lies in slot f, and causes the movement of c with arbor b.

A horizontal arm, F, is rigidly secured to disk 0, on which the supports and'train of gear-wheels are arranged to give motion to the earth and moon. A pin, h, projecting downward from arm F or disk 6, enters the elliptic recess O. In the flange D around recess 0 are vertically-projecting pins 6, constituting an elliptic gear, Whose major axis is in line with the major axis of the elliptic recess 0. Upon a stud at the under side of arm F is loosely fixed a gear-wheel, I, that meshes with the teeth i.

By this construction the rotary motion of arbor 7) swings disk 0 and arm F by means of arm 9. The teeth of gear I engage with pins t and thepin h, at the same time taking against the inner elliptic rim of flange D, the move ment of disk 0, and consequently of arm F, conforming tothe elliptic recess G. The disk 0 conforms to this movement by sliding on collar d and arm 9.

The outer end of arm F is formed with a ver tical socket for a post, G, that supports earth ;K. The post G projects below the arm F and carries a gear-wheel, P, corresponding in its number of teeth and meshing with gear I, and both P and I correspond in their number of teeth with pins 1'. By this means, while the arm F and its attachments move around the quently the north pole of the earth swings to and from the sun as the earth goes around.

A sleeve, Z, having an enlarged upper rim,

Z, sets around post Gr above arm F. The south pole of the earth K rests upon the rim l, and the diurnal revolution of earth K is obtained rests upon collar d and beneath a collar on sun S once the gear-wheel I and post G make one direction, or toward the north, and conse- 2 Sheeis-Sheet 1.

-J. S. MoDONALD. (lover for Holding Carbon Sheets.

No. 221,839. Patented Nov. 18, I879.

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